Description
dat_map$continent = c("Oceania", "Asia", "America", "America", "Asia", "Europe", "Africa", "Europe", "Europe", "Europe", "Europe", "Europe", "Oceania", "Europe", "Europe", "Europe", "Africa", "Europe", "America")
continent = dat_map %>%
group_by(continent) %>%
summarise(n_studies = sum(n_studies))
paste0(
"Among them, we were able to access the data of ",
length(unique(dat_main$ID)),
" unique studies. Out of the ",
length(unique(dat_main$ID)),
" studies (n=",
sum(dat_mod$N),
" participants), ",
continent[continent$continent=="America", ]$n_studies,
" were conducted in America (",
"among which ",
dat_map[dat_map$COUNTRY=="USA",]$n_studies,
" were conducted in the USA), ",
continent[continent$continent=="Europe", ]$n_studies,
" in Europe, ",
continent[continent$continent=="Oceania", ]$n_studies,
" in Africa, ",
continent[continent$continent=="Asia", ]$n_studies,
" in Asia, and ",
continent[continent$continent=="Africa", ]$n_studies,
" in Oceania. The number of participants per study ranged from ",
min(as.numeric(dat_main$N)),
" to ",
max(as.numeric(dat_main$N)),
". The mean length of follow up ranged from ",
min(as.numeric(dat_main$followupduration, na.rm=TRUE)),
" years to ",
round(max(as.numeric(dat_main$followupduration, na.rm=TRUE))),
" years. Among the ",
sum(dat_prim[!duplicated(dat_prim$ID),]$Cut_off_date=="Official"),
" studies included in our main analyses, ",
sum(dat_prim[!duplicated(dat_prim$ID),]$diag.procedure=="Diagnosis", na.rm=TRUE),
" studies categorized ADHD using a formal diagnostic procedure, ",
sum(dat_prim[!duplicated(dat_prim$ID),]$diag.procedure=="Symptoms", na.rm=TRUE),
" based on symptoms count, and ",
sum(dat_prim[!duplicated(dat_prim$ID),]$diag.procedure=="Broad-based-scale", na.rm=TRUE),
" based on the results of broad-based scales (such as the CBCL or SDQ)."
)
## [1] "Among them, we were able to access the data of 58 unique studies. Out of the 58 studies (n=6539 participants), 26 were conducted in America (among which 23 were conducted in the USA), 22 in Europe, 5 in Africa, 3 in Asia, and 2 in Oceania. The number of participants per study ranged from 10 to 813. The mean length of follow up ranged from 4 years to 33 years. Among the 42 studies included in our main analyses, 22 studies categorized ADHD using a formal diagnostic procedure, 12 based on symptoms count, and 8 based on the results of broad-based scales (such as the CBCL or SDQ)."